What happens if you check-in with wrong passport details?
What if I don't correct the details? If there's a mistake in your name, nationality, date of birth, or passport/ID details, the carrier might not allow you to board. You might also face difficulties getting through immigration.
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Airlines typically require passport information during the online check-in process, especially for international flights. In such cases, you will need your passport number or PRN. The PNR number contains all your essential information and is required for online check-in.
Final: since the data you entered during online checkin is always overwritten during the document check, it is impossible to be denied boarding for the mistakes/typos made during online checkin*. Even if for some reason the airline decides to verify it, they would simply enter the correct the data and let you through.
If your personal details (such as name, date of birth, etc.) will remain the same, then you can provide your new passport at the checkin desk without issue. The API (Advanced Passenger Information) that includes among other things your passport information can be updated as long as the flight has not departed.
There is no guarantee that you can travel with a misspelled name on passport as some airlines may not accept you onboard. You can play it safe by carrying an extra ID to prove your identity.
Answer: As part of the TSA's Secure Flight Program, the names on airline tickets must match the name on passports. We recommend that you contact the airline you are traveling with to see if they can provide a solution for the name mismatch.
While it is not required to have a passport to make flight reservations, it is strongly recommended. While you may be able to book your airline ticket without your passport number, you must have a valid passport in hand before you arrive at the airport.
Use your old passport and you will be able to travel anywhere as long as there is 6 months validity remaining. Might be different for each country. In the US they take your old passport while processing the new one.